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Rhythm Pharmaceuticals
RYTM

285 hedge funds and large institutions have $6.42B invested in Rhythm Pharmaceuticals in 2026 Q1 according to their latest regulatory filings, with 64 funds opening new positions, 101 increasing their positions, 89 reducing their positions, and 51 closing their positions.

New
Increased
Maintained
Reduced
Closed

776% more call options, than puts

Call options by funds: $16.4M | Put options by funds: $1.87M

25% more first-time investments, than exits

New positions opened: 64 | Existing positions closed: 51

13% more repeat investments, than reductions

Existing positions increased: 101 | Existing positions reduced: 89

2% more funds holding

Funds holding: 279 → 285 (+6)

0% more funds holding in top 10

Funds holding in top 10: 10 → 10 (0)

1.43% less ownership

Funds ownership: 109.17% → 107.74% (-1.4%)

18% less capital invested

Capital invested by funds: $7.8B → $6.42B (-$1.38B)

Holders
285
Holders Change
+6
Holders Change %
+2.15%
% of All Funds
3.51%
Holding in Top 10
10
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.12%
New
64
Increased
101
Reduced
89
Closed
51
Calls
$16.4M
Puts
$1.87M
Net Calls
+$14.5M
Net Calls Change
+$1.06M

Top Buyers

1
Citadel Advisors
Citadel Advisors
Florida
+$123M
2
Westfield Capital Management
Westfield Capital Management
Massachusetts
+$64.4M
3
PCH
Polar Capital Holdings
United Kingdom
+$41.8M
4
Point72 Asset Management
Point72 Asset Management
Connecticut
+$40.6M
5
Bank of America
Bank of America
North Carolina
+$39.3M

Top Sellers

1
NMC
NEA Management Company
Maryland
-$311M
2
Jennison Associates
Jennison Associates
New York
-$98.3M
3
DCM
Driehaus Capital Management
Illinois
-$82.5M
4
Federated Hermes
Federated Hermes
Pennsylvania
-$32.8M
5
Lord, Abbett & Co
Lord, Abbett & Co
New Jersey
-$26.3M
Name Holding Trade Value Shares
Change 		Change in
Stake
Aberdeen Group
76
Aberdeen Group
United Kingdom
$6.9M +$7.72M +79,357 New
GIM
77
Granahan Investment Management
Massachusetts
$6.76M +$2.36M +24,257 +45%
Neuberger Berman Group
78
Neuberger Berman Group
New York
$6.39M -$13.4K -138 -0.2%
WCM Investment Management
79
WCM Investment Management
California
$6.23M +$3.48M +35,815 +80%
RhumbLine Advisers
80
RhumbLine Advisers
Massachusetts
$6.08M -$132K -1,354 -2%
KCM
81
Kennedy Capital Management
Missouri
$5.72M +$2.52M +25,931 +65%
California State Teachers Retirement System (CalSTRS)
82
California State Teachers Retirement System (CalSTRS)
California
$5.72M +$1.19M +12,269 +23%
Universal-Beteiligungs- und Servicegesellschaft
83
Universal-Beteiligungs- und Servicegesellschaft
Germany
$5.47M -$5.89M -60,601 -49%
BOCH
84
Blue Owl Capital Holdings
New York
$5.34M +$5.98M +61,455 New
XT
85
XTX Topco
Cayman Islands
$5.17M +$4.77M +49,069 +470%
AQR Capital Management
86
AQR Capital Management
Connecticut
$5.16M -$1.05M -10,767 -15%
AG
87
Algert Global
California
$5.09M -$2.89M -29,737 -34%
AI
88
Atom Investors
Texas
$4.96M +$3.31M +34,071 +149%
Balyasny Asset Management
89
Balyasny Asset Management
Illinois
$4.61M -$1.88M -19,315 -27%
CM
90
Castleark Management
Illinois
$4.55M -$1.19M -12,200 -19%
Susquehanna International Group
91
Susquehanna International Group
Pennsylvania
$4.42M +$4.54M +46,687 +1,140%
Manulife (Manufacturers Life Insurance)
92
Manulife (Manufacturers Life Insurance)
Ontario, Canada
$4.42M -$860K -8,840 -15%
PMAM
93
Picton Mahoney Asset Management
Ontario, Canada
$4.38M +$4.9M +50,372 New
Rafferty Asset Management
94
Rafferty Asset Management
New York
$4.36M -$527K -5,421 -10%
Raymond James Financial
95
Raymond James Financial
Florida
$4.34M +$856K +8,805 +21%
VAM
96
Vanguard Asset Management
$4.32M +$4.83M +49,689 New
NFGH
97
Nan Fung Group Holdings
Hong Kong
$4.27M – – –
HIS
98
Harvest Investment Services
Illinois
$4.22M +$439K +4,515 +10%
Legal & General Group
99
Legal & General Group
United Kingdom
$4.09M -$782K -8,043 -15%
SAM
100
Silvercrest Asset Management
New York
$4.08M +$1.24M +12,760 +37%
2 3
4
5 6

RYTM Hedge Fund Activity: Q1 2026 in Review

285 of the 8,126 institutional investors tracked by Wall St. Rank reported a position in Rhythm Pharmaceuticals (RYTM) for Q1 2026, worth a combined $6.42B — down 18% from $7.8B a quarter earlier.

Buyers outnumbered sellers: 64 funds opened new RYTM positions and 51 closed out — a net gain of 13 holders — while 101 added to existing stakes and 89 trimmed.

The largest buyer was Citadel Advisors, adding an estimated $123M. The largest seller was NEA Management Company, exiting entirely with an estimated $311M sold.

  • 285 institutional investors held Rhythm Pharmaceuticals (RYTM) as of Q1 2026, up from 279 in Q4 2025.
  • Funds reported $6.42B of Rhythm Pharmaceuticals stock for Q1 2026, down 18% quarter-over-quarter.
  • 64 funds opened new Rhythm Pharmaceuticals positions in Q1 2026 and 51 closed out, a net change of +13 holders.
  • The largest Rhythm Pharmaceuticals buyer in Q1 2026 was Citadel Advisors, an estimated $123M added.
  • The largest Rhythm Pharmaceuticals seller in Q1 2026 was NEA Management Company, an estimated $311M sold.

Based on aggregated 13F filings for Q1 2026.